CAPE Physics Unit 2 · 2017 · Paper 1 · Question Q26
Item 26 refers to the following diagram of an amplifier circuit.
[Circuit diagram of an op-amp comparator driving an LED, with reference voltage V_1 at inverting input and LDR potential divider voltage V_2 at non-inverting input]
In the amplifier circuit shown above, the LED comes on when
- (A)
V_1 = 0 - (B)
V_1 = V_2 - (C)
V_1 < V_2 - (D)
V_1 > V_2
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